BEIJING--Heavy haze   still covered north and east China on Saturday, with highways closed and flights delayed or canceled  . The smoggy weather affected the country's land from north to south, including Beijing, Hebei, Shandong, Jiangsu, Shanghai, Zhejiang, Hunan, Guangxi and Guangdong, with visibility less than 50 meters in some areas. Cities like Shanghai and Nanjing have been enveloped in the grey sky for the past several days. Many walkers in the street had to wear masks. In the Lukou airport in Nanjing, Jiangsu Province, more than 60 inbound and outbound flights were canceled on Saturday because of the hazy, which also forced primary and middle schools and kindergartens to stop classes on Thursday and Friday in Nanjing. The Ministry of Environmental Protection said earlier this week that there were several main reasons behind the widespread haze: unfavorable weather conditions making it difficult for pollutants to diffuse  , motor vehicle exhaust  , coal use for winter heating. The Chinese government now plans to clean up the air by cutting coal use, closing some factories and promoting cleaner production. "We must face up to the realities," said Yan Naiqiang, a professor of environmental science at Shanghai Jiao Tong University. "The treatment of smog will be a long battle." Which of the following statements is TRUE? A) Few people go out because of the heavy haze. B) China is trying to take action to solve such kind of problems. C) Big cities in east China are easily affected by the bad weather. D) Students in Shanghai even stop their classes because of the bad weather.
B

Americans love cars.They go everywhere in them.8 5%of people in the US go to and from work by car. And most adults have driving licenses.Why does this car culture exist? How it started America's love of cars started after the war when soldiers returned home from World War II to rebuild their lives.They borrowed money from the government to buy houses and cars which became the symbols of status .The more money they had,the bigger their cars were. Making of roads During the war,President Eisenhower noticed what good roads Germany had.He decided to build new four-lane roads in America.He said if something happened suddenly,the two-lane roads wouldn't be able to carry all the cars that would suddenly leave the cities.Car and oil companies liked his idea and started. Car lover Not just teenagers are crazy about cars.Some Americans love their cars so much that they paint their cars beautifully .These are called Art Cars.Every April there is an activity in Houston,Texas,where they show their cars. Pollution Cars have polluted the environment.American President Bush refused a worldwide law that is against pollution.Many countries were angry about it.Bush said he had to think of the American economy and all the American people that make money from cars.Factories say they want to make cars that pollute less.But others say making cars that pollute less will never be as good as having fewer cars. When did Americans begin to love cars? A) Before the new two-lane roads were built. B) After World War II. C) During World War II. D) Before World War II.
B

Scientists   think that many animals cannot see colours. The world is black and white to them. Scientists want to find out if   dogs can see colours. When the scientists give the dogs food, they show them a certain colour every time. The dogs get ready to eat when they see this colour. The scientists then show the dogs another colour. Again the dogs get ready to eat. The colours are all the same to them. Colours are not all the same to monkeys. For example, if we put food in a red box, and do this every day, a monkey will always go to the red box to get food. If we put food in a blue box, the monkey won't go to it. Colours are   _  . A) all the same to monkeys B) not all the same to dogs C) different to dogs D) not all the same to monkeys

D